Rare book
Desirable book, sufficiently difficult to find that it seldom, or at least only occasionally, appears in the antiquarian trade
Book collecting is the collecting of books, including seeking, locating, acquiring, organizing, cataloging, displaying, storing, and maintaining whatever books are of interest to a given collector. The love of books is bibliophilia, and someone who loves to read, admire, and a person who collects books is often called a bibliophile.
Also known as...
rare books and rare print
AI firms buy and shred rare books
AI companies are buying rare books only to destroy them for training data.